Include images added to 3d model when exporting to glTF, OBJ, or DAE
The glTF Blender addon supports meshes with textures, but I'm not sure about standalone image imports... You'll probably need to create planes and add your images to them. For best results, see the guidelines in https://docs.blender.org/manual/en/2.80/addons/io_scene_gltf2.html.